drivers/hwmon/vt8231.c

   1 /*
   2         vt8231.c - Part of lm_sensors, Linux kernel modules
   3                                 for hardware monitoring
   4
   5         Copyright (c) 2005 Roger Lucas <roger@planbit.co.uk>
   6         Copyright (c) 2002 Mark D. Studebaker <mdsxyz123@yahoo.com>
   7                            Aaron M. Marsh <amarsh@sdf.lonestar.org>
   8
   9         This program is free software; you can redistribute it and/or modify
  10         it under the terms of the GNU General Public License as published by
  11         the Free Software Foundation; either version 2 of the License, or
  12         (at your option) any later version.
  13
  14         This program is distributed in the hope that it will be useful,
  15         but WITHOUT ANY WARRANTY; without even the implied warranty of
  16         MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17         GNU General Public License for more details.
  18
  19         You should have received a copy of the GNU General Public License
  20         along with this program; if not, write to the Free Software
  21         Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 /* Supports VIA VT8231 South Bridge embedded sensors
  25 */
  26
  27 #include <linux/module.h>
  28 #include <linux/init.h>
  29 #include <linux/slab.h>
  30 #include <linux/pci.h>
  31 #include <linux/jiffies.h>
  32 #include <linux/i2c.h>
  33 #include <linux/i2c-isa.h>
  34 #include <linux/hwmon.h>
  35 #include <linux/hwmon-sysfs.h>
  36 #include <linux/hwmon-vid.h>
  37 #include <linux/err.h>
  38 #include <linux/mutex.h>
  39 #include <asm/io.h>
  40
  41 static int force_addr;
  42 module_param(force_addr, int, 0);
  43 MODULE_PARM_DESC(force_addr, "Initialize the base address of the sensors");
  44
  45 /* Device address
  46    Note that we can't determine the ISA address until we have initialized
  47    our module */
  48 static unsigned short isa_address;
  49
  50 #define VT8231_EXTENT 0x80
  51 #define VT8231_BASE_REG 0x70
  52 #define VT8231_ENABLE_REG 0x74
  53
  54 /* The VT8231 registers
  55
  56    The reset value for the input channel configuration is used (Reg 0x4A=0x07)
  57    which sets the selected inputs marked with '*' below if multiple options are
  58    possible:
  59
  60                     Voltage Mode          Temperature Mode
  61         Sensor        Linux Id        Linux Id        VIA Id
  62         --------      --------        --------        ------
  63         CPU Diode       N/A             temp1           0
  64         UIC1            in0             temp2 *         1
  65         UIC2            in1 *           temp3           2
  66         UIC3            in2 *           temp4           3
  67         UIC4            in3 *           temp5           4
  68         UIC5            in4 *           temp6           5
  69         3.3V            in5             N/A
  70
  71    Note that the BIOS may set the configuration register to a different value
  72    to match the motherboard configuration.
  73 */
  74
  75 /* fans numbered 0-1 */
  76 #define VT8231_REG_FAN_MIN(nr)  (0x3b + (nr))
  77 #define VT8231_REG_FAN(nr)      (0x29 + (nr))
  78
  79 /* Voltage inputs numbered 0-5 */
  80
  81 static const u8 regvolt[]    = { 0x21, 0x22, 0x23, 0x24, 0x25, 0x26 };
  82 static const u8 regvoltmax[] = { 0x3d, 0x2b, 0x2d, 0x2f, 0x31, 0x33 };
  83 static const u8 regvoltmin[] = { 0x3e, 0x2c, 0x2e, 0x30, 0x32, 0x34 };
  84
  85 /* Temperatures are numbered 1-6 according to the Linux kernel specification.
  86 **
  87 ** In the VIA datasheet, however, the temperatures are numbered from zero.
  88 ** Since it is important that this driver can easily be compared to the VIA
  89 ** datasheet, we will use the VIA numbering within this driver and map the
  90 ** kernel sysfs device name to the VIA number in the sysfs callback.
  91 */
  92
  93 #define VT8231_REG_TEMP_LOW01   0x49
  94 #define VT8231_REG_TEMP_LOW25   0x4d
  95
  96 static const u8 regtemp[]    = { 0x1f, 0x21, 0x22, 0x23, 0x24, 0x25 };
  97 static const u8 regtempmax[] = { 0x39, 0x3d, 0x2b, 0x2d, 0x2f, 0x31 };
  98 static const u8 regtempmin[] = { 0x3a, 0x3e, 0x2c, 0x2e, 0x30, 0x32 };
  99
 100 #define TEMP_FROM_REG(reg)              (((253 * 4 - (reg)) * 550 + 105) / 210)
 101 #define TEMP_MAXMIN_FROM_REG(reg)       (((253 - (reg)) * 2200 + 105) / 210)
 102 #define TEMP_MAXMIN_TO_REG(val)         (253 - ((val) * 210 + 1100) / 2200)
 103
 104 #define VT8231_REG_CONFIG 0x40
 105 #define VT8231_REG_ALARM1 0x41
 106 #define VT8231_REG_ALARM2 0x42
 107 #define VT8231_REG_FANDIV 0x47
 108 #define VT8231_REG_UCH_CONFIG 0x4a
 109 #define VT8231_REG_TEMP1_CONFIG 0x4b
 110 #define VT8231_REG_TEMP2_CONFIG 0x4c
 111
 112 /* temps 0-5 as numbered in VIA datasheet - see later for mapping to Linux
 113 ** numbering
 114 */
 115 #define ISTEMP(i, ch_config) ((i) == 0 ? 1 : \
 116                               ((ch_config) >> ((i)+1)) & 0x01)
 117 /* voltages 0-5 */
 118 #define ISVOLT(i, ch_config) ((i) == 5 ? 1 : \
 119                               !(((ch_config) >> ((i)+2)) & 0x01))
 120
 121 #define DIV_FROM_REG(val) (1 << (val))
 122
 123 /* NB  The values returned here are NOT temperatures.  The calibration curves
 124 **     for the thermistor curves are board-specific and must go in the
 125 **     sensors.conf file.  Temperature sensors are actually ten bits, but the
 126 **     VIA datasheet only considers the 8 MSBs obtained from the regtemp[]
 127 **     register.  The temperature value returned should have a magnitude of 3,
 128 **     so we use the VIA scaling as the "true" scaling and use the remaining 2
 129 **     LSBs as fractional precision.
 130 **
 131 **     All the on-chip hardware temperature comparisons for the alarms are only
 132 **     8-bits wide, and compare against the 8 MSBs of the temperature.  The bits
 133 **     in the registers VT8231_REG_TEMP_LOW01 and VT8231_REG_TEMP_LOW25 are
 134 **     ignored.
 135 */
 136
 137 /******** FAN RPM CONVERSIONS ********
 138 ** This chip saturates back at 0, not at 255 like many the other chips.
 139 ** So, 0 means 0 RPM
 140 */
 141 static inline u8 FAN_TO_REG(long rpm, int div)
 142 {
 143         if (rpm == 0)
 144                 return 0;
 145         return SENSORS_LIMIT(1310720 / (rpm * div), 1, 255);
 146 }
 147
 148 #define FAN_FROM_REG(val, div) ((val) == 0 ? 0 : 1310720 / ((val) * (div)))
 149
 150 struct vt8231_data {
 151         struct i2c_client client;
 152         struct mutex update_lock;
 153         struct class_device *class_dev;
 154         char valid;             /* !=0 if following fields are valid */
 155         unsigned long last_updated;     /* In jiffies */
 156
 157         u8 in[6];               /* Register value */
 158         u8 in_max[6];           /* Register value */
 159         u8 in_min[6];           /* Register value */
 160         u16 temp[6];            /* Register value 10 bit, right aligned */
 161         u8 temp_max[6];         /* Register value */
 162         u8 temp_min[6];         /* Register value */
 163         u8 fan[2];              /* Register value */
 164         u8 fan_min[2];          /* Register value */
 165         u8 fan_div[2];          /* Register encoding, shifted right */
 166         u16 alarms;             /* Register encoding */
 167         u8 uch_config;
 168 };
 169
 170 static struct pci_dev *s_bridge;
 171 static int vt8231_detect(struct i2c_adapter *adapter);
 172 static int vt8231_detach_client(struct i2c_client *client);
 173 static struct vt8231_data *vt8231_update_device(struct device *dev);
 174 static void vt8231_init_client(struct i2c_client *client);
 175
 176 static inline int vt8231_read_value(struct i2c_client *client, u8 reg)
 177 {
 178         return inb_p(client->addr + reg);
 179 }
 180
 181 static inline void vt8231_write_value(struct i2c_client *client, u8 reg,
 182                                         u8 value)
 183 {
 184         outb_p(value, client->addr + reg);
 185 }
 186
 187 /* following are the sysfs callback functions */
 188 static ssize_t show_in(struct device *dev, struct device_attribute *attr,
 189                 char *buf)
 190 {
 191         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 192         int nr = sensor_attr->index;
 193         struct vt8231_data *data = vt8231_update_device(dev);
 194
 195         return sprintf(buf, "%d\n", ((data->in[nr] - 3) * 10000) / 958);
 196 }
 197
 198 static ssize_t show_in_min(struct device *dev, struct device_attribute *attr,
 199                 char *buf)
 200 {
 201         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 202         int nr = sensor_attr->index;
 203         struct vt8231_data *data = vt8231_update_device(dev);
 204
 205         return sprintf(buf, "%d\n", ((data->in_min[nr] - 3) * 10000) / 958);
 206 }
 207
 208 static ssize_t show_in_max(struct device *dev, struct device_attribute *attr,
 209                 char *buf)
 210 {
 211         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 212         int nr = sensor_attr->index;
 213         struct vt8231_data *data = vt8231_update_device(dev);
 214
 215         return sprintf(buf, "%d\n", (((data->in_max[nr] - 3) * 10000) / 958));
 216 }
 217
 218 static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
 219                 const char *buf, size_t count)
 220 {
 221         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 222         int nr = sensor_attr->index;
 223         struct i2c_client *client = to_i2c_client(dev);
 224         struct vt8231_data *data = i2c_get_clientdata(client);
 225         unsigned long val = simple_strtoul(buf, NULL, 10);
 226
 227         mutex_lock(&data->update_lock);
 228         data->in_min[nr] = SENSORS_LIMIT(((val * 958) / 10000) + 3, 0, 255);
 229         vt8231_write_value(client, regvoltmin[nr], data->in_min[nr]);
 230         mutex_unlock(&data->update_lock);
 231         return count;
 232 }
 233
 234 static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,
 235                 const char *buf, size_t count)
 236 {
 237         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 238         int nr = sensor_attr->index;
 239         struct i2c_client *client = to_i2c_client(dev);
 240         struct vt8231_data *data = i2c_get_clientdata(client);
 241         unsigned long val = simple_strtoul(buf, NULL, 10);
 242
 243         mutex_lock(&data->update_lock);
 244         data->in_max[nr] = SENSORS_LIMIT(((val * 958) / 10000) + 3, 0, 255);
 245         vt8231_write_value(client, regvoltmax[nr], data->in_max[nr]);
 246         mutex_unlock(&data->update_lock);
 247         return count;
 248 }
 249
 250 /* Special case for input 5 as this has 3.3V scaling built into the chip */
 251 static ssize_t show_in5(struct device *dev, struct device_attribute *attr,
 252                 char *buf)
 253 {
 254         struct vt8231_data *data = vt8231_update_device(dev);
 255
 256         return sprintf(buf, "%d\n",
 257                 (((data->in[5] - 3) * 10000 * 54) / (958 * 34)));
 258 }
 259
 260 static ssize_t show_in5_min(struct device *dev, struct device_attribute *attr,
 261                 char *buf)
 262 {
 263         struct vt8231_data *data = vt8231_update_device(dev);
 264
 265         return sprintf(buf, "%d\n",
 266                 (((data->in_min[5] - 3) * 10000 * 54) / (958 * 34)));
 267 }
 268
 269 static ssize_t show_in5_max(struct device *dev, struct device_attribute *attr,
 270                 char *buf)
 271 {
 272         struct vt8231_data *data = vt8231_update_device(dev);
 273
 274         return sprintf(buf, "%d\n",
 275                 (((data->in_max[5] - 3) * 10000 * 54) / (958 * 34)));
 276 }
 277
 278 static ssize_t set_in5_min(struct device *dev, struct device_attribute *attr,
 279                 const char *buf, size_t count)
 280 {
 281         struct i2c_client *client = to_i2c_client(dev);
 282         struct vt8231_data *data = i2c_get_clientdata(client);
 283         unsigned long val = simple_strtoul(buf, NULL, 10);
 284
 285         mutex_lock(&data->update_lock);
 286         data->in_min[5] = SENSORS_LIMIT(((val * 958 * 34) / (10000 * 54)) + 3,
 287                                         0, 255);
 288         vt8231_write_value(client, regvoltmin[5], data->in_min[5]);
 289         mutex_unlock(&data->update_lock);
 290         return count;
 291 }
 292
 293 static ssize_t set_in5_max(struct device *dev, struct device_attribute *attr,
 294                 const char *buf, size_t count)
 295 {
 296         struct i2c_client *client = to_i2c_client(dev);
 297         struct vt8231_data *data = i2c_get_clientdata(client);
 298         unsigned long val = simple_strtoul(buf, NULL, 10);
 299
 300         mutex_lock(&data->update_lock);
 301         data->in_max[5] = SENSORS_LIMIT(((val * 958 * 34) / (10000 * 54)) + 3,
 302                                         0, 255);
 303         vt8231_write_value(client, regvoltmax[5], data->in_max[5]);
 304         mutex_unlock(&data->update_lock);
 305         return count;
 306 }
 307
 308 #define define_voltage_sysfs(offset)                            \
 309 static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO,          \
 310                 show_in, NULL, offset);                         \
 311 static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR,  \
 312                 show_in_min, set_in_min, offset);               \
 313 static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR,  \
 314                 show_in_max, set_in_max, offset)
 315
 316 define_voltage_sysfs(0);
 317 define_voltage_sysfs(1);
 318 define_voltage_sysfs(2);
 319 define_voltage_sysfs(3);
 320 define_voltage_sysfs(4);
 321
 322 static DEVICE_ATTR(in5_input, S_IRUGO, show_in5, NULL);
 323 static DEVICE_ATTR(in5_min, S_IRUGO | S_IWUSR, show_in5_min, set_in5_min);
 324 static DEVICE_ATTR(in5_max, S_IRUGO | S_IWUSR, show_in5_max, set_in5_max);
 325
 326 /* Temperatures */
 327 static ssize_t show_temp0(struct device *dev, struct device_attribute *attr,
 328                 char *buf)
 329 {
 330         struct vt8231_data *data = vt8231_update_device(dev);
 331         return sprintf(buf, "%d\n", data->temp[0] * 250);
 332 }
 333
 334 static ssize_t show_temp0_max(struct device *dev, struct device_attribute *attr,
 335                 char *buf)
 336 {
 337         struct vt8231_data *data = vt8231_update_device(dev);
 338         return sprintf(buf, "%d\n", data->temp_max[0] * 1000);
 339 }
 340
 341 static ssize_t show_temp0_min(struct device *dev, struct device_attribute *attr,
 342                 char *buf)
 343 {
 344         struct vt8231_data *data = vt8231_update_device(dev);
 345         return sprintf(buf, "%d\n", data->temp_min[0] * 1000);
 346 }
 347
 348 static ssize_t set_temp0_max(struct device *dev, struct device_attribute *attr,
 349                 const char *buf, size_t count)
 350 {
 351         struct i2c_client *client = to_i2c_client(dev);
 352         struct vt8231_data *data = i2c_get_clientdata(client);
 353         int val = simple_strtol(buf, NULL, 10);
 354
 355         mutex_lock(&data->update_lock);
 356         data->temp_max[0] = SENSORS_LIMIT((val + 500) / 1000, 0, 255);
 357         vt8231_write_value(client, regtempmax[0], data->temp_max[0]);
 358         mutex_unlock(&data->update_lock);
 359         return count;
 360 }
 361 static ssize_t set_temp0_min(struct device *dev, struct device_attribute *attr,
 362                 const char *buf, size_t count)
 363 {
 364         struct i2c_client *client = to_i2c_client(dev);
 365         struct vt8231_data *data = i2c_get_clientdata(client);
 366         int val = simple_strtol(buf, NULL, 10);
 367
 368         mutex_lock(&data->update_lock);
 369         data->temp_min[0] = SENSORS_LIMIT((val + 500) / 1000, 0, 255);
 370         vt8231_write_value(client, regtempmin[0], data->temp_min[0]);
 371         mutex_unlock(&data->update_lock);
 372         return count;
 373 }
 374
 375 static ssize_t show_temp(struct device *dev, struct device_attribute *attr,
 376                 char *buf)
 377 {
 378         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 379         int nr = sensor_attr->index;
 380         struct vt8231_data *data = vt8231_update_device(dev);
 381         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));
 382 }
 383
 384 static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr,
 385                 char *buf)
 386 {
 387         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 388         int nr = sensor_attr->index;
 389         struct vt8231_data *data = vt8231_update_device(dev);
 390         return sprintf(buf, "%d\n", TEMP_MAXMIN_FROM_REG(data->temp_max[nr]));
 391 }
 392
 393 static ssize_t show_temp_min(struct device *dev, struct device_attribute *attr,
 394                 char *buf)
 395 {
 396         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 397         int nr = sensor_attr->index;
 398         struct vt8231_data *data = vt8231_update_device(dev);
 399         return sprintf(buf, "%d\n", TEMP_MAXMIN_FROM_REG(data->temp_min[nr]));
 400 }
 401
 402 static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
 403                 const char *buf, size_t count)
 404 {
 405         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 406         int nr = sensor_attr->index;
 407         struct i2c_client *client = to_i2c_client(dev);
 408         struct vt8231_data *data = i2c_get_clientdata(client);
 409         int val = simple_strtol(buf, NULL, 10);
 410
 411         mutex_lock(&data->update_lock);
 412         data->temp_max[nr] = SENSORS_LIMIT(TEMP_MAXMIN_TO_REG(val), 0, 255);
 413         vt8231_write_value(client, regtempmax[nr], data->temp_max[nr]);
 414         mutex_unlock(&data->update_lock);
 415         return count;
 416 }
 417 static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr,
 418                 const char *buf, size_t count)
 419 {
 420         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 421         int nr = sensor_attr->index;
 422         struct i2c_client *client = to_i2c_client(dev);
 423         struct vt8231_data *data = i2c_get_clientdata(client);
 424         int val = simple_strtol(buf, NULL, 10);
 425
 426         mutex_lock(&data->update_lock);
 427         data->temp_min[nr] = SENSORS_LIMIT(TEMP_MAXMIN_TO_REG(val), 0, 255);
 428         vt8231_write_value(client, regtempmin[nr], data->temp_min[nr]);
 429         mutex_unlock(&data->update_lock);
 430         return count;
 431 }
 432
 433 /* Note that these map the Linux temperature sensor numbering (1-6) to the VIA
 434 ** temperature sensor numbering (0-5)
 435 */
 436 #define define_temperature_sysfs(offset)                                \
 437 static SENSOR_DEVICE_ATTR(temp##offset##_input, S_IRUGO,                \
 438                 show_temp, NULL, offset - 1);                           \
 439 static SENSOR_DEVICE_ATTR(temp##offset##_max, S_IRUGO | S_IWUSR,        \
 440                 show_temp_max, set_temp_max, offset - 1);               \
 441 static SENSOR_DEVICE_ATTR(temp##offset##_max_hyst, S_IRUGO | S_IWUSR,   \
 442                 show_temp_min, set_temp_min, offset - 1)
 443
 444 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp0, NULL);
 445 static DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR, show_temp0_max, set_temp0_max);
 446 static DEVICE_ATTR(temp1_max_hyst, S_IRUGO | S_IWUSR, show_temp0_min, set_temp0_min);
 447
 448 define_temperature_sysfs(2);
 449 define_temperature_sysfs(3);
 450 define_temperature_sysfs(4);
 451 define_temperature_sysfs(5);
 452 define_temperature_sysfs(6);
 453
 454 /* Fans */
 455 static ssize_t show_fan(struct device *dev, struct device_attribute *attr,
 456                 char *buf)
 457 {
 458         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 459         int nr = sensor_attr->index;
 460         struct vt8231_data *data = vt8231_update_device(dev);
 461         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
 462                                 DIV_FROM_REG(data->fan_div[nr])));
 463 }
 464
 465 static ssize_t show_fan_min(struct device *dev, struct device_attribute *attr,
 466                 char *buf)
 467 {
 468         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 469         int nr = sensor_attr->index;
 470         struct vt8231_data *data = vt8231_update_device(dev);
 471         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
 472                         DIV_FROM_REG(data->fan_div[nr])));
 473 }
 474
 475 static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr,
 476                 char *buf)
 477 {
 478         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 479         int nr = sensor_attr->index;
 480         struct vt8231_data *data = vt8231_update_device(dev);
 481         return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
 482 }
 483
 484 static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
 485                 const char *buf, size_t count)
 486 {
 487         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 488         int nr = sensor_attr->index;
 489         struct i2c_client *client = to_i2c_client(dev);
 490         struct vt8231_data *data = i2c_get_clientdata(client);
 491         int val = simple_strtoul(buf, NULL, 10);
 492
 493         mutex_lock(&data->update_lock);
 494         data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
 495         vt8231_write_value(client, VT8231_REG_FAN_MIN(nr), data->fan_min[nr]);
 496         mutex_unlock(&data->update_lock);
 497         return count;
 498 }
 499
 500 static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
 501                 const char *buf, size_t count)
 502 {
 503         struct i2c_client *client = to_i2c_client(dev);
 504         struct vt8231_data *data = i2c_get_clientdata(client);
 505         struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr);
 506         unsigned long val = simple_strtoul(buf, NULL, 10);
 507         int nr = sensor_attr->index;
 508         int old = vt8231_read_value(client, VT8231_REG_FANDIV);
 509         long min = FAN_FROM_REG(data->fan_min[nr],
 510                                  DIV_FROM_REG(data->fan_div[nr]));
 511
 512         mutex_lock(&data->update_lock);
 513         switch (val) {
 514         case 1: data->fan_div[nr] = 0; break;
 515         case 2: data->fan_div[nr] = 1; break;
 516         case 4: data->fan_div[nr] = 2; break;
 517         case 8: data->fan_div[nr] = 3; break;
 518         default:
 519                 dev_err(&client->dev, "fan_div value %ld not supported."
 520                         "Choose one of 1, 2, 4 or 8!\n", val);
 521                 mutex_unlock(&data->update_lock);
 522                 return -EINVAL;
 523         }
 524
 525         /* Correct the fan minimum speed */
 526         data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
 527         vt8231_write_value(client, VT8231_REG_FAN_MIN(nr), data->fan_min[nr]);
 528
 529         old = (old & 0x0f) | (data->fan_div[1] << 6) | (data->fan_div[0] << 4);
 530         vt8231_write_value(client, VT8231_REG_FANDIV, old);
 531         mutex_unlock(&data->update_lock);
 532         return count;
 533 }
 534
 535
 536 #define define_fan_sysfs(offset)                                        \
 537 static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO,                 \
 538                 show_fan, NULL, offset - 1);                            \
 539 static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR,         \
 540                 show_fan_div, set_fan_div, offset - 1);                 \
 541 static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR,         \
 542                 show_fan_min, set_fan_min, offset - 1)
 543
 544 define_fan_sysfs(1);
 545 define_fan_sysfs(2);
 546
 547 /* Alarms */
 548 static ssize_t show_alarms(struct device *dev, struct device_attribute *attr,
 549                            char *buf)
 550 {
 551         struct vt8231_data *data = vt8231_update_device(dev);
 552         return sprintf(buf, "%d\n", data->alarms);
 553 }
 554
 555 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 556
 557 static struct attribute *vt8231_attributes_temps[6][4] = {
 558         {
 559                 &dev_attr_temp1_input.attr,
 560                 &dev_attr_temp1_max_hyst.attr,
 561                 &dev_attr_temp1_max.attr,
 562                 NULL
 563         }, {
 564                 &sensor_dev_attr_temp2_input.dev_attr.attr,
 565                 &sensor_dev_attr_temp2_max_hyst.dev_attr.attr,
 566                 &sensor_dev_attr_temp2_max.dev_attr.attr,
 567                 NULL
 568         }, {
 569                 &sensor_dev_attr_temp3_input.dev_attr.attr,
 570                 &sensor_dev_attr_temp3_max_hyst.dev_attr.attr,
 571                 &sensor_dev_attr_temp3_max.dev_attr.attr,
 572                 NULL
 573         }, {
 574                 &sensor_dev_attr_temp4_input.dev_attr.attr,
 575                 &sensor_dev_attr_temp4_max_hyst.dev_attr.attr,
 576                 &sensor_dev_attr_temp4_max.dev_attr.attr,
 577                 NULL
 578         }, {
 579                 &sensor_dev_attr_temp5_input.dev_attr.attr,
 580                 &sensor_dev_attr_temp5_max_hyst.dev_attr.attr,
 581                 &sensor_dev_attr_temp5_max.dev_attr.attr,
 582                 NULL
 583         }, {
 584                 &sensor_dev_attr_temp6_input.dev_attr.attr,
 585                 &sensor_dev_attr_temp6_max_hyst.dev_attr.attr,
 586                 &sensor_dev_attr_temp6_max.dev_attr.attr,
 587                 NULL
 588         }
 589 };
 590
 591 static const struct attribute_group vt8231_group_temps[6] = {
 592         { .attrs = vt8231_attributes_temps[0] },
 593         { .attrs = vt8231_attributes_temps[1] },
 594         { .attrs = vt8231_attributes_temps[2] },
 595         { .attrs = vt8231_attributes_temps[3] },
 596         { .attrs = vt8231_attributes_temps[4] },
 597         { .attrs = vt8231_attributes_temps[5] },
 598 };
 599
 600 static struct attribute *vt8231_attributes_volts[6][4] = {
 601         {
 602                 &sensor_dev_attr_in0_input.dev_attr.attr,
 603                 &sensor_dev_attr_in0_min.dev_attr.attr,
 604                 &sensor_dev_attr_in0_max.dev_attr.attr,
 605                 NULL
 606         }, {
 607                 &sensor_dev_attr_in1_input.dev_attr.attr,
 608                 &sensor_dev_attr_in1_min.dev_attr.attr,
 609                 &sensor_dev_attr_in1_max.dev_attr.attr,
 610                 NULL
 611         }, {
 612                 &sensor_dev_attr_in2_input.dev_attr.attr,
 613                 &sensor_dev_attr_in2_min.dev_attr.attr,
 614                 &sensor_dev_attr_in2_max.dev_attr.attr,
 615                 NULL
 616         }, {
 617                 &sensor_dev_attr_in3_input.dev_attr.attr,
 618                 &sensor_dev_attr_in3_min.dev_attr.attr,
 619                 &sensor_dev_attr_in3_max.dev_attr.attr,
 620                 NULL
 621         }, {
 622                 &sensor_dev_attr_in4_input.dev_attr.attr,
 623                 &sensor_dev_attr_in4_min.dev_attr.attr,
 624                 &sensor_dev_attr_in4_max.dev_attr.attr,
 625                 NULL
 626         }, {
 627                 &dev_attr_in5_input.attr,
 628                 &dev_attr_in5_min.attr,
 629                 &dev_attr_in5_max.attr,
 630                 NULL
 631         }
 632 };
 633
 634 static const struct attribute_group vt8231_group_volts[6] = {
 635         { .attrs = vt8231_attributes_volts[0] },
 636         { .attrs = vt8231_attributes_volts[1] },
 637         { .attrs = vt8231_attributes_volts[2] },
 638         { .attrs = vt8231_attributes_volts[3] },
 639         { .attrs = vt8231_attributes_volts[4] },
 640         { .attrs = vt8231_attributes_volts[5] },
 641 };
 642
 643 static struct attribute *vt8231_attributes[] = {
 644         &sensor_dev_attr_fan1_input.dev_attr.attr,
 645         &sensor_dev_attr_fan2_input.dev_attr.attr,
 646         &sensor_dev_attr_fan1_min.dev_attr.attr,
 647         &sensor_dev_attr_fan2_min.dev_attr.attr,
 648         &sensor_dev_attr_fan1_div.dev_attr.attr,
 649         &sensor_dev_attr_fan2_div.dev_attr.attr,
 650         &dev_attr_alarms.attr,
 651         NULL
 652 };
 653
 654 static const struct attribute_group vt8231_group = {
 655         .attrs = vt8231_attributes,
 656 };
 657
 658 static struct i2c_driver vt8231_driver = {
 659         .driver = {
 660                 .owner  = THIS_MODULE,
 661                 .name   = "vt8231",
 662         },
 663         .attach_adapter = vt8231_detect,
 664         .detach_client  = vt8231_detach_client,
 665 };
 666
 667 static struct pci_device_id vt8231_pci_ids[] = {
 668         { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8231_4) },
 669         { 0, }
 670 };
 671
 672 MODULE_DEVICE_TABLE(pci, vt8231_pci_ids);
 673
 674 static int __devinit vt8231_pci_probe(struct pci_dev *dev,
 675                                       const struct pci_device_id *id);
 676
 677 static struct pci_driver vt8231_pci_driver = {
 678         .name           = "vt8231",
 679         .id_table       = vt8231_pci_ids,
 680         .probe          = vt8231_pci_probe,
 681 };
 682
 683 int vt8231_detect(struct i2c_adapter *adapter)
 684 {
 685         struct i2c_client *client;
 686         struct vt8231_data *data;
 687         int err = 0, i;
 688         u16 val;
 689
 690         /* 8231 requires multiple of 256 */
 691         if (force_addr) {
 692                 isa_address = force_addr & 0xFF00;
 693                 dev_warn(&adapter->dev, "forcing ISA address 0x%04X\n",
 694                                  isa_address);
 695                 if (PCIBIOS_SUCCESSFUL != pci_write_config_word(s_bridge,
 696                                                 VT8231_BASE_REG, isa_address))
 697                         return -ENODEV;
 698         }
 699
 700         if (PCIBIOS_SUCCESSFUL !=
 701                 pci_read_config_word(s_bridge, VT8231_ENABLE_REG, &val))
 702                 return -ENODEV;
 703
 704         if (!(val & 0x0001)) {
 705                 dev_warn(&adapter->dev, "enabling sensors\n");
 706                 if (PCIBIOS_SUCCESSFUL !=
 707                         pci_write_config_word(s_bridge, VT8231_ENABLE_REG,
 708                                                           val | 0x0001))
 709                         return -ENODEV;
 710         }
 711
 712         /* Reserve the ISA region */
 713         if (!request_region(isa_address, VT8231_EXTENT,
 714                             vt8231_pci_driver.name)) {
 715                 dev_err(&adapter->dev, "region 0x%x already in use!\n",
 716                            isa_address);
 717                 return -ENODEV;
 718         }
 719
 720         if (!(data = kzalloc(sizeof(struct vt8231_data), GFP_KERNEL))) {
 721                 err = -ENOMEM;
 722                 goto exit_release;
 723         }
 724
 725         client = &data->client;
 726         i2c_set_clientdata(client, data);
 727         client->addr = isa_address;
 728         client->adapter = adapter;
 729         client->driver = &vt8231_driver;
 730
 731         /* Fill in the remaining client fields and put into the global list */
 732         strlcpy(client->name, "vt8231", I2C_NAME_SIZE);
 733
 734         mutex_init(&data->update_lock);
 735
 736         /* Tell the I2C layer a new client has arrived */
 737         if ((err = i2c_attach_client(client)))
 738                 goto exit_free;
 739
 740         vt8231_init_client(client);
 741
 742         /* Register sysfs hooks */
 743         if ((err = sysfs_create_group(&client->dev.kobj, &vt8231_group)))
 744                 goto exit_detach;
 745
 746         /* Must update device information to find out the config field */
 747         data->uch_config = vt8231_read_value(client, VT8231_REG_UCH_CONFIG);
 748
 749         for (i = 0; i < ARRAY_SIZE(vt8231_group_temps); i++) {
 750                 if (ISTEMP(i, data->uch_config)) {
 751                         if ((err = sysfs_create_group(&client->dev.kobj,
 752                                         &vt8231_group_temps[i])))
 753                                 goto exit_remove_files;
 754                 }
 755         }
 756
 757         for (i = 0; i < ARRAY_SIZE(vt8231_group_volts); i++) {
 758                 if (ISVOLT(i, data->uch_config)) {
 759                         if ((err = sysfs_create_group(&client->dev.kobj,
 760                                         &vt8231_group_volts[i])))
 761                                 goto exit_remove_files;
 762                 }
 763         }
 764
 765         data->class_dev = hwmon_device_register(&client->dev);
 766         if (IS_ERR(data->class_dev)) {
 767                 err = PTR_ERR(data->class_dev);
 768                 goto exit_remove_files;
 769         }
 770         return 0;
 771
 772 exit_remove_files:
 773         for (i = 0; i < ARRAY_SIZE(vt8231_group_volts); i++)
 774                 sysfs_remove_group(&client->dev.kobj, &vt8231_group_volts[i]);
 775
 776         for (i = 0; i < ARRAY_SIZE(vt8231_group_temps); i++)
 777                 sysfs_remove_group(&client->dev.kobj, &vt8231_group_temps[i]);
 778
 779         sysfs_remove_group(&client->dev.kobj, &vt8231_group);
 780 exit_detach:
 781         i2c_detach_client(client);
 782 exit_free:
 783         kfree(data);
 784 exit_release:
 785         release_region(isa_address, VT8231_EXTENT);
 786         return err;
 787 }
 788
 789 static int vt8231_detach_client(struct i2c_client *client)
 790 {
 791         struct vt8231_data *data = i2c_get_clientdata(client);
 792         int err, i;
 793
 794         hwmon_device_unregister(data->class_dev);
 795
 796         for (i = 0; i < ARRAY_SIZE(vt8231_group_volts); i++)
 797                 sysfs_remove_group(&client->dev.kobj, &vt8231_group_volts[i]);
 798
 799         for (i = 0; i < ARRAY_SIZE(vt8231_group_temps); i++)
 800                 sysfs_remove_group(&client->dev.kobj, &vt8231_group_temps[i]);
 801
 802         sysfs_remove_group(&client->dev.kobj, &vt8231_group);
 803
 804         if ((err = i2c_detach_client(client))) {
 805                 return err;
 806         }
 807
 808         release_region(client->addr, VT8231_EXTENT);
 809         kfree(data);
 810
 811         return 0;
 812 }
 813
 814 static void vt8231_init_client(struct i2c_client *client)
 815 {
 816         vt8231_write_value(client, VT8231_REG_TEMP1_CONFIG, 0);
 817         vt8231_write_value(client, VT8231_REG_TEMP2_CONFIG, 0);
 818 }
 819
 820 static struct vt8231_data *vt8231_update_device(struct device *dev)
 821 {
 822         struct i2c_client *client = to_i2c_client(dev);
 823         struct vt8231_data *data = i2c_get_clientdata(client);
 824         int i;
 825         u16 low;
 826
 827         mutex_lock(&data->update_lock);
 828
 829         if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
 830             || !data->valid) {
 831                 for (i = 0; i < 6; i++) {
 832                         if (ISVOLT(i, data->uch_config)) {
 833                                 data->in[i] = vt8231_read_value(client,
 834                                                 regvolt[i]);
 835                                 data->in_min[i] = vt8231_read_value(client,
 836                                                 regvoltmin[i]);
 837                                 data->in_max[i] = vt8231_read_value(client,
 838                                                 regvoltmax[i]);
 839                         }
 840                 }
 841                 for (i = 0; i < 2; i++) {
 842                         data->fan[i] = vt8231_read_value(client,
 843                                                 VT8231_REG_FAN(i));
 844                         data->fan_min[i] = vt8231_read_value(client,
 845                                                 VT8231_REG_FAN_MIN(i));
 846                 }
 847
 848                 low = vt8231_read_value(client, VT8231_REG_TEMP_LOW01);
 849                 low = (low >> 6) | ((low & 0x30) >> 2)
 850                     | (vt8231_read_value(client, VT8231_REG_TEMP_LOW25) << 4);
 851                 for (i = 0; i < 6; i++) {
 852                         if (ISTEMP(i, data->uch_config)) {
 853                                 data->temp[i] = (vt8231_read_value(client,
 854                                                        regtemp[i]) << 2)
 855                                                 | ((low >> (2 * i)) & 0x03);
 856                                 data->temp_max[i] = vt8231_read_value(client,
 857                                                       regtempmax[i]);
 858                                 data->temp_min[i] = vt8231_read_value(client,
 859                                                       regtempmin[i]);
 860                         }
 861                 }
 862
 863                 i = vt8231_read_value(client, VT8231_REG_FANDIV);
 864                 data->fan_div[0] = (i >> 4) & 0x03;
 865                 data->fan_div[1] = i >> 6;
 866                 data->alarms = vt8231_read_value(client, VT8231_REG_ALARM1) |
 867                         (vt8231_read_value(client, VT8231_REG_ALARM2) << 8);
 868
 869                 /* Set alarm flags correctly */
 870                 if (!data->fan[0] && data->fan_min[0]) {
 871                         data->alarms |= 0x40;
 872                 } else if (data->fan[0] && !data->fan_min[0]) {
 873                         data->alarms &= ~0x40;
 874                 }
 875
 876                 if (!data->fan[1] && data->fan_min[1]) {
 877                         data->alarms |= 0x80;
 878                 } else if (data->fan[1] && !data->fan_min[1]) {
 879                         data->alarms &= ~0x80;
 880                 }
 881
 882                 data->last_updated = jiffies;
 883                 data->valid = 1;
 884         }
 885
 886         mutex_unlock(&data->update_lock);
 887
 888         return data;
 889 }
 890
 891 static int __devinit vt8231_pci_probe(struct pci_dev *dev,
 892                                 const struct pci_device_id *id)
 893 {
 894         u16 val;
 895
 896         if (PCIBIOS_SUCCESSFUL != pci_read_config_word(dev, VT8231_BASE_REG,
 897                                                         &val))
 898                 return -ENODEV;
 899
 900         isa_address = val & ~(VT8231_EXTENT - 1);
 901         if (isa_address == 0 && force_addr == 0) {
 902                 dev_err(&dev->dev, "base address not set -\
 903                                  upgrade BIOS or use force_addr=0xaddr\n");
 904                 return -ENODEV;
 905         }
 906
 907         s_bridge = pci_dev_get(dev);
 908
 909         if (i2c_isa_add_driver(&vt8231_driver)) {
 910                 pci_dev_put(s_bridge);
 911                 s_bridge = NULL;
 912         }
 913
 914         /* Always return failure here.  This is to allow other drivers to bind
 915          * to this pci device.  We don't really want to have control over the
 916          * pci device, we only wanted to read as few register values from it.
 917          */
 918         return -ENODEV;
 919 }
 920
 921 static int __init sm_vt8231_init(void)
 922 {
 923         return pci_register_driver(&vt8231_pci_driver);
 924 }
 925
 926 static void __exit sm_vt8231_exit(void)
 927 {
 928         pci_unregister_driver(&vt8231_pci_driver);
 929         if (s_bridge != NULL) {
 930                 i2c_isa_del_driver(&vt8231_driver);
 931                 pci_dev_put(s_bridge);
 932                 s_bridge = NULL;
 933         }
 934 }
 935
 936 MODULE_AUTHOR("Roger Lucas <roger@planbit.co.uk>");
 937 MODULE_DESCRIPTION("VT8231 sensors");
 938 MODULE_LICENSE("GPL");
 939
 940 module_init(sm_vt8231_init);
 941 module_exit(sm_vt8231_exit);